Mine intrinsic safety electric source interception self-recovery protection device

Abstract

The invention discloses a mine intrinsic safety electric source interception self-recovery protection device, which consists of a detecting circuit, a monostable circuit, a signal isolation overlapping circuit and a drive accelerating circuit, wherein the detecting circuit is divided into two routes, one route is connected with the monostable circuit, and the other route is connected with the signal isolation overlapping circuit; the output of the monostable circuit is connected with the signal isolation overlapping circuit; and the output of the signal isolation overlapping circuit is connected with the drive accelerating circuit. The device is suitable for mine intrinsic safety electric source output short circuit protection, can thoroughly cut off the output current under the condition of the short circuit of the output end of the mine intrinsic safety electric source, can realize the output voltage self-recovery function when solving the failure, and reduces the energy released by an electric source when having the failure of short circuit, thereby reducing the energy released by sparkle generated by the short circuit, preventing flammable and combustible gas from being fired by the short circuit sparkle, being capable of reducing the consumption of switch devices when having short circuit, improving the efficiency, and solving the problem of radiation.

Description

technical field [0001] The invention relates to an output short-circuit protection device of an intrinsically safe power supply for mines, and is especially suitable for output short-circuit protection of intrinsically safe power supplies for mines, and is also suitable for output short-circuit protection of conventional power supplies. Background technique [0002] In the underground electric control system, a large number of intrinsically safe power supplies are used. The safe and reliable performance of these essential power sources is of great significance to underground safe production. In order to prevent the flammable and explosive gas from being ignited by the spark generated when the output end of the downhole intrinsically safe power supply is short-circuited (overloaded), the energy released by the short-circuit spark must be reduced. For intrinsically safe power supplies with low output power and no voltage stabilization requirements, energy-limiting protection ...

AI Technical Summary

Problems solved by technology

Among them, the cut-off current type protection circuit is more complicated, and the power supply is not easy to recover automatically after the circuit fault is eliminated.

From the working characteristics of the intrinsically safe power supply, it can be known that when the output terminal is short-circuited, if no special protection circuit is added, although the output voltage is zero, the output current is very large.

A large short-circuit current is potentially dangerous to the surrounding environment full of flammable and explosive gases

In addition, the short-circuit current increases the turn-on loss of the switching device, making the problem of heat dissipation particularly prominent

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